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WSL2-Linux-Kernel
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WSL2-Linux-Kernel/kernel/trace
История
Tze-nan Wu cd10d186a5 tracing: Fix overflow in get_free_elt() 
commit bcf86c01ca4676316557dd482c8416ece8c2e143 upstream.

"tracing_map->next_elt" in get_free_elt() is at risk of overflowing.

Once it overflows, new elements can still be inserted into the tracing_map
even though the maximum number of elements (`max_elts`) has been reached.
Continuing to insert elements after the overflow could result in the
tracing_map containing "tracing_map->max_size" elements, leaving no empty
entries.
If any attempt is made to insert an element into a full tracing_map using
`__tracing_map_insert()`, it will cause an infinite loop with preemption
disabled, leading to a CPU hang problem.

Fix this by preventing any further increments to "tracing_map->next_elt"
once it reaches "tracing_map->max_elt".

Cc: stable@vger.kernel.org
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Fixes: 08d43a5fa0 ("tracing: Add lock-free tracing_map")
Co-developed-by: Cheng-Jui Wang <cheng-jui.wang@mediatek.com>
Link: https://lore.kernel.org/20240805055922.6277-1-Tze-nan.Wu@mediatek.com
Signed-off-by: Cheng-Jui Wang <cheng-jui.wang@mediatek.com>
Signed-off-by: Tze-nan Wu <Tze-nan.Wu@mediatek.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2024-08-19 05:45:47 +02:00
..
Kconfig tracing: Build event generation tests only as modules 2024-07-05 09:14:29 +02:00
Makefile tracing: Place trace_pid_list logic into abstract functions 2022-07-29 17:25:29 +02:00
blktrace.c trace/blktrace: fix memory leak with using debugfs_lookup() 2023-03-10 09:39:47 +01:00
bpf_trace.c bpf: Remove trace_printk_lock 2024-03-01 13:21:43 +01:00
bpf_trace.h bpf: Use dedicated bpf_trace_printk event instead of trace_printk() 2020-07-13 16:55:49 -07:00
error_report-traces.c tracing: add error_report_end trace point 2021-02-26 09:41:02 -08:00
fgraph.c tracing: Fix various typos in comments 2021-03-23 14:08:18 -04:00
ftrace.c ftrace: Fix possible use-after-free issue in ftrace_location() 2024-07-05 09:14:12 +02:00
ftrace_internal.h x86/ftrace: Have ftrace trampolines turn read-only at the end of system boot up 2020-05-12 18:24:34 -04:00
kprobe_event_gen_test.c tracing: Fix wrong return in kprobe_event_gen_test.c 2023-04-05 11:24:54 +02:00
pid_list.c tracing: Place trace_pid_list logic into abstract functions 2022-07-29 17:25:29 +02:00
pid_list.h tracing: Place trace_pid_list logic into abstract functions 2022-07-29 17:25:29 +02:00
power-traces.c
…
preemptirq_delay_test.c tracing: Add MODULE_DESCRIPTION() to preemptirq_delay_test 2024-07-05 09:14:36 +02:00
ring_buffer.c ring-buffer: Fix a race between readers and resize checks 2024-06-16 13:39:12 +02:00
ring_buffer_benchmark.c sched,tracing: Convert to sched_set_fifo() 2020-07-29 11:43:53 +02:00
rpm-traces.c
…
synth_event_gen_test.c tracing / synthetic: Disable events after testing in synth_event_gen_test_init() 2024-01-05 15:13:35 +01:00
trace.c tracing: Use .flush() call to wake up readers 2024-04-10 16:18:45 +02:00
trace.h tracing: Fix uaf issue when open the hist or hist_debug file 2024-01-25 14:52:29 -08:00
trace_benchmark.c tracing: Fix some typos in comments 2020-11-10 20:39:40 -05:00
trace_benchmark.h
…
trace_boot.c tracing: Initialize integer variable to prevent garbage return value 2022-06-09 10:23:21 +02:00
trace_branch.c tracing: Merge irqflags + preempt counter. 2021-02-02 17:02:06 -05:00
trace_clock.c tracing: Do no increment trace_clock_global() by one 2021-06-18 09:10:00 -04:00
trace_dynevent.c tracing: Free buffers when a used dynamic event is removed 2022-12-08 11:28:43 +01:00
trace_dynevent.h tracing: Add DYNAMIC flag for dynamic events 2021-08-18 18:10:32 -04:00
trace_entries.h trace: Add timerlat tracer 2021-06-25 19:57:24 -04:00
trace_eprobe.c kernel/trace: Fix cleanup logic of enable_trace_eprobe 2023-07-23 13:47:43 +02:00
trace_event_perf.c tracing: Show size of requested perf buffer 2024-05-02 16:24:47 +02:00
trace_events.c tracing: hide unused ftrace_event_id_fops 2024-04-17 11:15:16 +02:00
trace_events_filter.c tracing: Have trace_event_file have ref counters 2023-11-28 16:56:36 +00:00
trace_events_filter_test.h
…
trace_events_hist.c tracing: Fix uaf issue when open the hist or hist_debug file 2024-01-25 14:52:29 -08:00
trace_events_inject.c tracing: Have event inject files inc the trace array ref count 2023-10-06 13:18:02 +02:00
trace_events_synth.c tracing: Have the user copy of synthetic event address use correct context 2023-11-28 16:56:31 +00:00
trace_events_trigger.c Revert "tracing/trigger: Fix to return error if failed to alloc snapshot" 2024-04-27 17:05:23 +02:00
trace_export.c tracing: Fix some typos in comments 2020-11-10 20:39:40 -05:00
trace_functions.c tracing: Add "func_no_repeats" option for function tracing 2021-04-15 14:50:02 -04:00
trace_functions_graph.c tracing: Disable "other" permission bits in the tracefs files 2021-11-18 19:16:15 +01:00
trace_hwlat.c tracing: Remove extra space at the end of hwlat_detector/mode 2023-09-19 12:22:48 +02:00
trace_irqsoff.c tracing: Fix memleak due to race between current_tracer and trace 2023-08-30 16:18:13 +02:00
trace_kdb.c kdb: Rename members of struct kdbtab_t 2021-07-27 17:05:06 +01:00
trace_kprobe.c tracing/kprobes: Fix symbol counting logic by looking at modules as well 2024-01-15 18:51:26 +01:00
trace_kprobe_selftest.c
…
trace_kprobe_selftest.h
…
trace_mmiotrace.c tracing: Remove definition of DEBUG in trace_mmiotrace.c 2021-02-02 17:02:07 -05:00
trace_nop.c
…
trace_osnoise.c tracing/osnoise: Fix duration type 2022-12-08 11:28:43 +01:00
trace_output.c tracing: Add size check when printing trace_marker output 2024-01-25 14:52:29 -08:00
trace_output.h ftrace: Add recording of functions that caused recursion 2020-11-06 08:42:26 -05:00
trace_preemptirq.c tracing: hold caller_addr to hardirq_{enable,disable}_ip 2022-09-20 12:39:43 +02:00
trace_printk.c tracing: Disable "other" permission bits in the tracefs files 2021-11-18 19:16:15 +01:00
trace_probe.c Revert "tracing: Add "(fault)" name injection to kernel probes" 2023-08-03 10:22:31 +02:00
trace_probe.h tracing/kprobes: Return EADDRNOTAVAIL when func matches several symbols 2023-12-23 10:42:00 +01:00
trace_probe_kernel.h tracing/probes: Fix to record 0-length data_loc in fetch_store_string*() if fails 2023-08-03 10:22:31 +02:00
trace_probe_tmpl.h tracing/probes: Fix to record 0-length data_loc in fetch_store_string*() if fails 2023-08-03 10:22:31 +02:00
trace_recursion_record.c tracing: Disable "other" permission bits in the tracefs files 2021-11-18 19:16:15 +01:00
trace_sched_switch.c tracing: Fix sched switch start/stop refcount racy updates 2020-01-30 09:46:10 -05:00
trace_sched_wakeup.c tracing: Fix memleak due to race between current_tracer and trace 2023-08-30 16:18:13 +02:00
trace_selftest.c tracing: Fix various typos in comments 2021-03-23 14:08:18 -04:00
trace_selftest_dynamic.c
…
trace_seq.c tracing: Fix various typos in comments 2021-03-23 14:08:18 -04:00
trace_stack.c tracing: Disable "other" permission bits in the tracefs files 2021-11-18 19:16:15 +01:00
trace_stat.c tracing: Disable "other" permission bits in the tracefs files 2021-11-18 19:16:15 +01:00
trace_stat.h
…
trace_synth.h tracing: Allow synthetic events to pass around stacktraces 2023-08-03 10:22:30 +02:00
trace_syscalls.c tracing: Make tp_printk work on syscall tracepoints 2022-06-14 18:36:14 +02:00
trace_uprobe.c bpf: Clear the probe_addr for uprobe 2023-09-19 12:22:32 +02:00
tracing_map.c tracing: Fix overflow in get_free_elt() 2024-08-19 05:45:47 +02:00
tracing_map.h tracing: Fix some typos in comments 2020-11-10 20:39:40 -05:00